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Finding the best dual purpose lithium marine battery is really about solving a space and weight problem that's plagued boaters for decades. If you've spent any time on the water, you know the drill: you need one beefy battery to crank the engine and another deep-cycle set to run your trolling motor, fish finders, and livewell pumps. It's a lot of heavy lead to haul around. But things have changed, and these modern lithium units are now capable of handling both jobs without breaking a sweat—or your back. ...